Critical Qt Declarative Vulnerability Causes Resource Exhaustion Risk
Severity: Medium (Score: 57.8)
Sources: Linuxsecurity, Ubuntu
Published: · Updated:
Keywords: ubuntu, declarative, made, excessive, resources, critical, resource
Severity indicators: critical, rce, rat
Summary
A vulnerability in Qt Declarative has been identified, allowing it to be exploited to consume excessive resources if it receives specially crafted input. This flaw affects multiple versions of Ubuntu, including 24.04 LTS, 22.04 LTS, and 20.04 LTS. The issue arises from improper validation of image tag attributes in the Text component of Qt Quick, potentially leading to denial of service. Users are advised to update their systems to the latest package versions to mitigate the risk. The vulnerability has been assigned the identifier USN-8357-1. Affected package versions include libqt5quick5 for Ubuntu 24.04 LTS and earlier versions for 22.04 LTS and 20.04 LTS. A standard system update is recommended to apply necessary changes. Ubuntu Pro users benefit from extended security coverage for these packages. Key Points: • Qt Declarative vulnerability allows resource exhaustion via specially crafted input. • Affected Ubuntu versions include 24.04 LTS, 22.04 LTS, and 20.04 LTS. • Users should update to the latest package versions to prevent denial of service.
Detailed Analysis
**Impact** Ubuntu 24.04 LTS, 22.04 LTS, and 20.04 LTS users and their derivatives are affected by this vulnerability. The flaw allows an attacker to cause Qt Declarative to consume excessive system resources, potentially leading to denial of service conditions. This impacts any organization or individual relying on Qt Quick components in these Ubuntu versions, with no specific sectors or geographies detailed. No data confidentiality or integrity risks are reported. **Technical Details** The vulnerability arises from improper validation of the width and height attributes of image tags within the Text component of Qt Quick’s Qt Declarative module. Attackers can exploit this by supplying specially crafted input to trigger resource exhaustion. No CVE identifier or malware/tools are mentioned. The attack targets the resource availability stage of the kill chain. No indicators of compromise (IOCs) are provided. **Recommended Response** Apply the updated libqt5quick5 packages provided via Ubuntu Pro for affected releases: 5.15.13+dfsg-1ubuntu0.1+esm1 for 24.04 LTS, 5.15.3+dfsg-1ubuntu0.1~esm1 for 22.04 LTS, and 5.12.8-0ubuntu1+esm1 for 20.04 LTS. Standard system updates will also address the issue. Monitor for unusual resource consumption in Qt Quick applications if patching is delayed. No specific detection or blocking rules are available.
Source articles (2)
- USN-8357-1: Qt Declarative vulnerability — Ubuntu · 2026-06-01
Qt Declarative could be made to use excessive resources if it received specially crafted input. It was discovered that Qt Declarative did not properly validate the width and height attributes of image… - Ubuntu 24.04 Critical Qt Declarative Resource Exhaustion USN-8357 — Linuxsecurity · 2026-06-01
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: Qt Declarative could be made to use excessive resources if it r…
Timeline
- 2026-06-01 — USN-8357-1 published: Ubuntu released a security notice regarding a vulnerability in Qt Declarative affecting multiple LTS versions.
- 2026-06-01 — Linuxsecurity reports on Qt Declarative vulnerability: Linuxsecurity detailed the resource exhaustion issue and affected Ubuntu releases, urging users to update their systems.
Related entities
- DDoS (Attack Type)
- Denial of Service (Attack Type)
- Cwe-400 - Uncontrolled Resource Consumption (Cwe)
- Qt Declarative (Platform)
- Qt Quick (Platform)
- Ubuntu (Company)